Not working:
generic SDHC card reader based on Alcor Micro controller, VID/PID 058f:6335 like this one (got mine with EMTEC SDHC card)
Standard Microsystems Corp. 9-in-2 Card Reader VID/PID 0424:2228- this one is salvaged form a dead Lexmark printer

EDITPartially working
Broadcom BCM57765/57785- built-in sd/mmc/ms card reader (Acer Aspire v3-571/e1-571 and others with the same motherboard)
-eMMC is visible in system as mmcblk0*
-also "hidden" eMMC partitions are visible:

i bought the TRANSCEND RDF5 USB 3.0 card reader a month ago on ebay,arrived yesterday.very great piece,it's much faster to write image on it.
before,using many different types of chinese reader,the only at low price whose read the emmc.with this 3.0 new reader,burn a image into emmc is so much fast!reccomanded!
ps--it's the 2nd in first post image.

I have ordered an U3, XU and 8gb (linux) and 16gb (android jellybean) eMMC modules.

The 16gb Android Jellybean for XU is working out of the box and is very fast. I can use it as a internet or desktopcomputer in the kitchen hanging from a creen wallmounted, very nice.

But the 8GB Linux emmc module did not work out of the box. It was ordered for the U3 and it didn't booted. Then I was curious and thought, lets read them from my desktop those both cards. And that was a surprice. Both cards were not recognised in Lubuntu on my desktop, pulling out the emmc with microsd attachjment and then replace it with 4 different microsd cards, they were all accepted. I think this reader is not compatible with the way the emmc modules for odroid are read out.

I am a bit disappointed but have now ordered that Transcend USB 3.0 cardreader to give this method another chance. It is the one below:

Transcend RDF5

1370000491.jpeg (18.71 KiB) Viewed 78821 times

In the meanwhile the U3 is running from a microSD card samsung class 10 with Lubuntu 13.x (don't know exact version raring ringtail). Starting smoothly desktop environment openbox with LXDE i think. XBMC gotham playing bluray very good, via cabled network and network filesystem nfsv4. Unfortunately I have not got automount working so have to click drives (mount) manually, but no problem.

I will let you now if I can flash the eMMc modules with my new to get Transcend RDF5 USB 3.0 cardreader.

Thanks for the quick reply. That makes me happy. However the fact that I am disappointed, I don't give up on that Transcend RDF5 reader. I know what your product can do already so I am not that worried. The Odroid XU running out of the box Jellybean 4.2.2 perfectly via HDMI on a BenQ FullHD GL2250 with Sound. But I want to flash that one to Lubuntu or Xubuntu so I can use it more like a desktop. Android just doesn't fit my needs.
I'll give an update as soon as I recieve the reader tomorrow.
Peace

When EXT drives are mounted with FUSE, the volumes are interpreted as network drives or servers, so if you are hiding desktop icons or connected servers from Finder preferences you won’t see it except in a Finder window sidebar.

Unfortunately the MicroSD eMMC Reader does not fit entirely into the card
slot of the stick, to get it fully inserted, one has to remove its casing,
which is easily done by removing the 2 little screws (Torx T5) and then
cautiously lifting (I simply used my nails, anything like a knife would have
done the same job) the black cover.

I can confirm this crappy dollarama Card Reader works with eMMC+eMMC Reader+SD card Reader in card reader :

Why do I put the emmc+emmc reader + sd card reader + usb card reader? Because the crappy dollarama card reader 1 out of 10 units work and even then not all ports work on the card reader. Mine has microsd port not working but sd card is. xD

Just FYI, this nasty piece of generic plastic refuses to recognise the eMMC adapter at all -- it does recognise it when plugged into an SD adapter, but corrupts the partition table and throws random I/O errors.

Got the Transcend RDF5k. Setup Android on an EMMc card via sd adapter right off worked fine. Then I decided that I would like to try Libreelec.
Plugged it all together again and continue to get: "an error occurred when attempting to lock the volume. Error 5: Access is denied"

Have tried several USB ports on both desktop and laptop, using Windows 10.